.info_box {
    padding: 15px 0;
    margin-bottom: 15px;
    border-bottom: 1px solid #ccc;
}

.info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}
.info_left{
    width: 45%;
    text-align: center;
}
.info_left img{
    height: 100%;
    max-height: 400px;
    max-width: 80%;
}
.info_right{
    width: 50%;
    padding: 20px 15px;
}
.info_right>p{
    margin-bottom: 20px;
}
.num_box{
    display: flex;
    margin: 20px 0;
    align-items: center;
}
.num_box input{
    border: 1px solid #ccc;
    text-align: center;
    border-left: 0;
    border-right: 0;
    width: 60px;
    align-self: stretch;
}
.num_box button{
    display: inline-block;
    border: 1px solid #ccc;
    padding: 3px 15px;
    text-align: center;
    font-size: 20px;
}
.num_box button:first-of-type{
    border-right: 0;
}
.num_box button:last-of-type{
    border-left: 0;
}
.btns{
    display: flex;
    align-items: center;
    margin-top: 60px;
}
.btns a{
    font-size: 14px;
    display: inline-block;
    margin-right: 20px;
    border: 1px solid #ccc;
    width: 120px;
    text-align: center;
    height: 35px;
    line-height: 35px;
    color: #fff;
    border-radius: 5px;
}
.btns a:first-of-type{
background-color: rgb(9, 171, 55);
}
.btns a:last-of-type{
   background-color: rgb(239, 166, 71); 
}
/* 图书介绍 */
.introduce h2 {
    font-size: 24px;
}

.introduce p {
    text-indent: 2em;
    line-height: 28px;
}

.box {
    height: 400px;
    text-indent: 2em;
    line-height: 30px;
}

.box p {
    margin-top: 20px;
}

.box p a {
    color: rgb(86, 6, 6);
    font-weight: 600;
}

.yqlj {
    width: 1200px;
    height: 50px;
    margin: 0 auto;
    margin-bottom: 20px;
}

.yqlj select {
    margin-top: 30px;
    margin-left: 150px;
    width: 200px;
    height: 40px;
    border: none;
}